Add comments on magic number 0xbb. They are VK_OEM_PLUS. I guess the original...

chrome/browser/autocomplete/autocomplete_edit_view_win.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/autocomplete/autocomplete_edit_view_win.h"
 
 #include <locale>
 
 #include "app/gfx/canvas.h"
 #include "app/l10n_util.h"
@@ skipping 889 matching lines @@
 
     case VK_DELETE:
     case VK_INSERT:
       return !e.IsAltDown() && e.IsShiftDown() && !e.IsControlDown();
 
     case 'X':
     case 'V':
       return !e.IsAltDown() && e.IsControlDown();
 
     case VK_BACK:
-    case 0xbb:
+    case 0xbb:  // We don't use VK_OEM_PLUS in case the macro isn't defined.
+                // (e.g., we don't have this symbol in embeded environment).
       return true;
 
     default:
       return false;
   }
 }
 
 void AutocompleteEditViewWin::HandleExternalMsg(UINT msg,
                                                 UINT flags,
                                                 const CPoint& screen_point) {
@@ skipping 887 matching lines @@
     case VK_TAB: {
       if (model_->is_keyword_hint() && !model_->keyword().empty()) {
         // Accept the keyword.
         ScopedFreeze freeze(this, GetTextObjectModel());
         model_->AcceptKeyword();
       }
       return true;
     }
 
     case 0xbb:  // Ctrl-'='.  Triggers subscripting (even in plain text mode).
+                // We don't use VK_OEM_PLUS in case the macro isn't defined.
+                // (e.g., we don't have this symbol in embeded environment).
       return true;
 
     default:
       return false;
   }
 }
 
 bool AutocompleteEditViewWin::OnKeyDownAllModes(TCHAR key,
                                                 UINT repeat_count,
                                                 UINT flags) {
@@ skipping 507 matching lines @@
     context_menu_contents_->AddItemWithStringId(IDS_PASTE_AND_GO,
                                                 IDS_PASTE_AND_GO);
     context_menu_contents_->AddSeparator();
     context_menu_contents_->AddItemWithStringId(IDS_SELECT_ALL, IDS_SELECT_ALL);
     context_menu_contents_->AddSeparator();
     context_menu_contents_->AddItemWithStringId(IDS_EDIT_SEARCH_ENGINES,
                                                 IDS_EDIT_SEARCH_ENGINES);
   }
   context_menu_.reset(new views::Menu2(context_menu_contents_.get()));
 }